CVE-2021-47548
Status: AnalyzedCritical (9.8)—
Severity9.8Critical · CVSS 3.1
Exploitation probability1.36 %higher than 71% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found
In the Linux kernel, the following vulnerability has been resolved:
ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()
limits the value of port less than DSAF_GE_NUM (i.e., 8). However, if the value of port is 6 or 7, an array overflow could occur: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off;
because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6).
To fix this possible array overflow, we first check port and if it is greater than or equal to DSAF_MAX_PORT_NUM, the function returns.
Technical details traces, logs and code from the original report
The if statement:
if (port >= DSAF_GE_NUM)
return;CVSS
- Base score
- 9.8
- Version
- 3.1
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 1.36 %
- Percentile among all scored CVEs
- 71
- Score date
- 10/21/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- CWE-129
References
Show 14 references
- https://git.kernel.org/stable/c/22519eff7df2d88adcc2568d86046ce1e2b52803
- https://git.kernel.org/stable/c/948968f8747650447c8f21c9fdba0e1973be040b
- https://git.kernel.org/stable/c/99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d
- https://git.kernel.org/stable/c/a66998e0fbf213d47d02813b9679426129d0d114
- https://git.kernel.org/stable/c/abbd5faa0748d0aa95d5191d56ff7a17a6275bd1
- https://git.kernel.org/stable/c/dd07f8971b81ad98cc754b179b331b57f35aa1ff
- https://git.kernel.org/stable/c/fc7ffa7f10b9454a86369405d9814bf141b30627
- https://git.kernel.org/stable/c/22519eff7df2d88adcc2568d86046ce1e2b52803
- https://git.kernel.org/stable/c/948968f8747650447c8f21c9fdba0e1973be040b
- https://git.kernel.org/stable/c/99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d
- https://git.kernel.org/stable/c/a66998e0fbf213d47d02813b9679426129d0d114
- https://git.kernel.org/stable/c/abbd5faa0748d0aa95d5191d56ff7a17a6275bd1
- https://git.kernel.org/stable/c/dd07f8971b81ad98cc754b179b331b57f35aa1ff
- https://git.kernel.org/stable/c/fc7ffa7f10b9454a86369405d9814bf141b30627
Raw JSON (NVD)
Show
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"description": [
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"value": "CWE-129"
}
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()\n\nThe if statement:\n if (port >= DSAF_GE_NUM)\n return;\n\nlimits the value of port less than DSAF_GE_NUM (i.e., 8).\nHowever, if the value of port is 6 or 7, an array overflow could occur:\n port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off;\n\nbecause the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6).\n\nTo fix this possible array overflow, we first check port and if it is\ngreater than or equal to DSAF_MAX_PORT_NUM, the function returns."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: ethernet: hisilicon: hns: hns_dsaf_misc: corrige un posible desbordamiento de matriz en hns_dsaf_ge_srst_by_port() La sentencia if: if (port >= DSAF_GE_NUM) return; limita el valor del puerto a menos de DSAF_GE_NUM (es decir, 8). Sin embargo, si el valor del puerto es 6 o 7, podría producirse un desbordamiento de la matriz: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off; porque la longitud de dsaf_dev->mac_cb es DSAF_MAX_PORT_NUM (es decir, 6). Para solucionar este posible desbordamiento de la matriz, primero verificamos el puerto y si es mayor o igual a DSAF_MAX_PORT_NUM, la función regresa."
}
],
"lastModified": "2026-06-17T04:17:44.320",
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